C + + Socket communication

The following code goes from CSDN:

Server:

Server.cpp:Defines the entry point for the console application.//#include "stdafx.h"#include "winsock2.h" #pragma comment (lib, "Ws2_32.lib")#include <iostream>using namespaceStd;int _tmain (int argc, char*Argv[]) {const int buf_size = 64;            Wsadata WSD;        Wsadata variable SOCKET sserver;        Server socket socket sclient;        Client socket sockaddr_in Addrserv;;    Server address char buf[buf_size];            The receive data buffer char sendbuf[buf_size];//returns the data to the client int retVal; return value//Initialize socket dynamic Library if (WSAStartup (Makeword (2,2), &AMP;WSD)! = 0) {cout << "WSAStartup failed!" <<Endl Return 1; }//Create socket sserver =Sockets (Af_inet, Sock_stream, ipproto_tcp); if (Invalid_socket = =sserver) {cout << "socket failed!" <<Endl WSACleanup ();//release socket resources; Return-1; }//server socket Address addrserv.sin_family =Af_inet; Addrserv.sin_port = htons (4999); ADDRSERV.SIN_ADDR.S_ADDR =Inaddr_any; Bind socket RetVal = Bind (Sserver, (lpsockaddr) &addrserv, sizeof(sockaddr_in)); if (Socket_error = =RetVal) {cout << bind failed! <<Endl Closesocket (sserver); Close socket WSACleanup (); Release socket resources; Return-1; }//Start monitoring RetVal = Listen (sserver, 1); if (Socket_error = =RetVal) {cout << "Listen failed!" <<Endl Closesocket (sserver); Close socket WSACleanup (); Release socket resources; Return-1; }//Accept client requestsSockaddr_in addrclient; int addrclientlen = sizeof(addrclient); Sclient = Accept (Sserver, (sockaddr far*) &addrclient, &Addrclientlen); if (Invalid_socket = = sclient) {cout << "accept failed!" << Endl; closesocket (sserver);//Close Socket wsacle Anup (); Release socket resources; Return-1;} while (True) {//Receive client Data zeromemory (buf, buf_size); retVal = recv (sclient, buf, buf_size, 0); I F (socket_error = = retVal) {cout << "recv failed!" << Endl; closesocket (sserver);//Close Socket closesocket (sclient); Close socket WSACleanup (); Release socket resources; Return-1;} if (buf[0] = = ' 0 ') break; cout << "Data sent by client:" << buf <<Endl; cout << "Send data to client:" ; CIN >> sendbuf; Send (Sclient, SendBuf, strlen (SendBuf), 0);}//Exit closesocket (sserver);//Close Socket CLOSESOC Ket (sclient); Close socket WSACleanup (); Release socket resources; return 0;}                

Client:

//Client.cpp:Defines the entry point for the console application.//#include"stdafx.h"#include"winsock2.h"#include<iostream>#pragmaComment (lib, "Ws2_32.lib")using namespacestd; BOOL Recvline (SOCKET s,Char* buf);//reading a row of dataintMainintargcChar*argv[]) {    Const intBuf_size = -;            Wsadata WSD; //wsadata VariableSOCKET Shost;//Server SocketsSockaddr_in servaddr;//Server Address    CharBuf[buf_size];//Receive data buffers    CharBufrecv[buf_size]; intRetVal;//return value//initializing a nested-word dynamic library    if(WSAStartup (Makeword (2,2), &AMP;WSD)! =0) {cout<<"WSAStartup failed!"<<Endl; return-1; }        //Creating SocketsShost =sockets (Af_inet, Sock_stream, ipproto_tcp); if(Invalid_socket = =shost) {cout<<"Socket failed!"<<Endl; WSACleanup ();//releasing a socket resource        return-1; }    //Set server addressservaddr.sin_family =af_inet; ServAddr.sin_addr.s_addr= Inet_addr ("127.0.0.1"); Servaddr.sin_port= Htons (( Short)4999); intNservaddlen =sizeof(SERVADDR); //connecting to a serverRetval=connect (Shost, (LPSOCKADDR) &servaddr,sizeof(SERVADDR)); if(Socket_error = =retVal) {cout<<"Connect failed!"<<Endl;    Closesocket (Shost); //Close SocketWSACleanup ();//releasing a socket resource        return-1; }     while(true){        //sending data to the serverZeroMemory (buf, buf_size); cout<<"to send data to the server:"; CIN>>buf; RetVal= Send (Shost, buf, strlen (BUF),0); if(Socket_error = =retVal) {cout<<"Send failed!"<<Endl;    Closesocket (Shost); //Close SocketWSACleanup ();//releasing a socket resource            return-1; }        //recvline (Shost, bufrecv);Recv (Shost, BUFRECV,5,0);//Receive server-side data and receive only 5 characterscout << Endl <<"To receive data from the server:"<<Bufrecv; }    //ExitClosesocket (Shost);//Close SocketWSACleanup ();//releasing a socket resource    return 0;}

C + + Socket communication